Well, in all honesty. I would not mind a new legendary Vader. Or as has been suggested, fallen Anakin.
When I see that we have 4 Version of Han Solo and definately more incoming....
I think, as long as character can be easily differentiated (picture, posture) I wouldn‘t mind if they‘d wear the same clothes.
Change Vader into Vader (Ep. IV) that makes room for more Vaders theoretically.
A Force choke Vader as the first character whose animation directly interacts with the target would be interesting: lifting his target in the air by force and give it the choke sound effect.
(On the Note of more interaction: I‘d Love to see Jedis/Siths deflect blaster shots or guard against light sabres when evading an attack. Or „normal“ characters duck, sidestep, do a roll)
Well, I still believe that a DS Journey is quite possible, if the willingness is there.
I just don‘t like the fact, that the DS apparently is excluded from certain events, just because there are no different possible skins for them, because villains usually don‘t change clothes -weird movie rule apparently- while there are certainly ways around mere clothes/armor...